package applicationFunction;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;

/**
 * 用来对图片处理
 */
public class ImagePixel {
    /**
     * 读取一张图片的RGB值
     *
     * @throws Exception
     */
    public void getImagePixel(String image) throws Exception {
        int[] rgb = new int[3];
        File file = new File(image);
        BufferedImage bi = null;
        try {
            bi = ImageIO.read(file);
        } catch (Exception e) {
            e.printStackTrace();
        }
        int width = bi.getWidth();
        int height = bi.getHeight();
        int minx = bi.getMinX();
        int miny = bi.getMinY();
        System.out.println("width=" + width + ",height=" + height + ".");
        System.out.println("minx=" + minx + ",miniy=" + miny + ".");
        for (int i = minx; i < width; i++) {
            for (int j = miny; j < height; j++) {
                int pixel = bi.getRGB(i, j); // 下面三行代码将一个数字转换为RGB数字
                rgb[0] = (pixel & 0xff0000) >> 16;
                rgb[1] = (pixel & 0xff00) >> 8;
                rgb[2] = (pixel & 0xff);
                System.out.println("i=" + i + ",j=" + j + ":(" + rgb[0] + ","
                        + rgb[1] + "," + rgb[2] + ")");
                bi.setRGB(123, 123, 123);
            }
        }
    }

    /**
     * 返回屏幕色彩值
     *
     * @param x
     * @param y
     * @return
     * @throws AWTException
     */
    public int getScreenPixel(int x, int y) throws AWTException { // 函数返回值为颜色的RGB值。
        Robot rb = null; // java.awt.image包中的类，可以用来抓取屏幕，即截屏。
        rb = new Robot();
        Toolkit tk = Toolkit.getDefaultToolkit(); // 获取缺省工具包
        Dimension di = tk.getScreenSize(); // 屏幕尺寸规格
        System.out.println(di.width);
        System.out.println(di.height);
        Rectangle rec = new Rectangle(0, 0, di.width, di.height);
        BufferedImage bi = rb.createScreenCapture(rec);
        int pixelColor = bi.getRGB(x, y);

        return 16777216 + pixelColor; // pixelColor的值为负，经过实践得出：加上颜色最大值就是实际颜色值。
    }

    /**
     * Java读取并修改像素的值。
     * @param path
     */
    private void setAlpha(String path) {
        /**
         *
         * 增加测试项
         * 读取图片，绘制成半透明,修改像素
         */
        try {
            ImageIcon imageIcon = new ImageIcon(path);
            BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight()
                    , BufferedImage.TYPE_4BYTE_ABGR);
            Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
            g2D.drawImage(imageIcon.getImage(), 0, 0,
                    imageIcon.getImageObserver());
            //循环每一个像素点，改变像素点的Alpha值
            int alpha = 100;
            for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
                for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
                    int pixel = bufferedImage.getRGB(j2, j1);
//                    System.out.println(Integer.toHexString(pixel));
//                    int[]   rgb = new int[3];
//                    rgb[0] = (pixel & 0xff0000) >> 16;
//                    rgb[1] = (pixel & 0xff00) >> 8;
//                    rgb[2] = (pixel & 0xff);
//                    System.out.println("i=" + j1 + ",j=" + j2 + ":(" + rgb[0] + ","
//                            + rgb[1] + "," + rgb[2] + ")");
                    //179*pow(2,16)+179*pow(2,8)+179
                    pixel = pixel==-1? (int) (179 * Math.pow(2, 16) + 179 * Math.pow(2, 8) + 179) :-1;
//                    pixel = ( (alpha + 1) << 24) | (pixel & 0x00ffffff);
                    bufferedImage.setRGB(j2, j1, pixel);
                }
            }
            g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());

            //生成图片为PNG
            ImageIO.write(bufferedImage, "jpg",  new File("D:\\xiao.jpg"));
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        int x = 0;
        ImagePixel rc = new ImagePixel();
//        x = rc.getScreenPixel(100, 345);
//        System.out.println(x + " - ");
        rc.getImagePixel("D:\\xiao.png");
//        rc.setAlpha("D:\\xiao.png");
    }

}